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The Nuttall Encyclopedia
The theory established by Darwin that the several species of plants and animals now in existence were not created in their present form, but have been evolved by natural law of descent, with modifications of structure, from cruder forms. See Darwin, C. R.
Wood, James, ed. Entry for 'Darwinian Theory'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/d/darwinian-theory.html. Frederick Warne & Co Ltd. London. 1900.